Elasticsearch cluster did not respond with license information

Hi, everyone
Today I upgraded ES and Kibana (5.4 to 6.8) followed the official documents.
ES looks well, but Kibana got a error:

Kibana log:

How can I solve this problem?

What was your Elasticsearch license before upgrading? The troubleshooting steps in this thread may help, namely the last comment: License Expired

It sounds like you may have installed the OSS distribution. How did you install Elasticsearch?

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